The entire point of minions is that Segal as a high level fighter would be bored fighting low level fighters to the point that low level fighters should not even be there. He still has to try, dodge attacks et all. So they get statted as minions for the purpose of fighting Segal because otherwise its impossible for Segal to have a challenging fight with a bunch of guys
If there were level 3 or 4 fighters, Segals player would leave the table because its a bunch of boring junk. Levels, hit points, attack ratings, defenses etc etc etc are all just abstractions used to entertain the players. All of these disappear when dealing with NPCs. If the players are playing and you need mooks, you stat them as minions for the players. If you want a monster that is tough all on its own, you stat it as a solo monster. If you want a monster that is tougher than the rest, but not a lot tougher, you stat it as an elite monster.
Why do we do this? Because at the fringes of to-hit rolls the game becomes too static. Its too easy when you can't be hit and its too hard when you can't hit your enemies. So if you make an enemy hard by increasing its level to the point where it stands in for 5 enemies, it would just wallop your normal party(E.G. if you were level 5 and wanted to add a monster to fight alone you would have to go to level 14 in order to reach XP parity, if you need info on why this is bad, go ahead and get a level 5 party and have them fight a Night Hag(lvl 14 Lurker) then Young Black Dragon(Lv 5 Solo Lurker) with the same resources). As such, instead of increasing levels to make a creature harder we add a solo template and now its a challenge alone. Instead of increasing levels to make a creature a bit tougher than the normal guys we add a template.
I agree from a game perspective that using minion mooks is more challenging than using low-level mooks.
But we were talking about a Steven Seagal movie. No dice, no character sheets, no game. In a movie, Seagal is paid lots of cash to show up on set each day, regardless of how bored he gets. The character he plays in the film has no say about showing up - the character shows up when Seagal shows up. So there is no boredom, or if there is, it has little bearing on the actual effort to make the movie.
So to take it back to 4e, yes, we have minions. That is one way to make mooks.
But it is not the only way.
There is nothing that says every encounter the PCs ever face must be challenging. Heck, one of the beautiful things about gaining levels is watching your character get more and more powerful. But if every fight always takes 8 rounds and leaves you bloodied and out of encounter powers, then you never get to FEEL more powerful. Sure, your level 30 fights have bigger numbers flying around than your level 1 fights, but the end result is still the same: 8 rounds of furious life-or-death action, expending all your encounter powers, ending up bloodied.
Once in a while, it might be fun to wipe the floor with a bunch of mooks. Especially if it's the same mooks that used to challenge you when you were lower level.
Remember that scene in Superman 2, when Superman gives up all his super powers to become mortal. Then he gets beat up in a bar by some big trucker guy. Then, later when he gets his power back, he goes back to the bar and trashes the trucker. Very satisfying.
It's just as satisfying when PCs get to do that.
The only way is to let them, once in a while, mop up some lowbie mooks.
Don't do it all the time. Don't bore your players. But once in a while, let them flex their new high-level muscles and actually feel powerful.
Besides, from a simulationist perspective, it's hard to imagine a bar full of bad guys, in which every one of them is vulnerable to house cats and hat pins, and not one of them (except for the boss and maybe a few of his senior henchmen) can put up a real fight. Mingle in some minions, some lowbie mooks, some mid level guys that can hit and take some hits, and a few high level guys that pose real threats.
Isn't that what a gang (or a town, or an army) would be like? Some members of any group are probably very new and green, others are highly trained, others have been part of the group for a long time and have lots of experience, still others are highly-trained AND have lots of experience.
And some of them go down with a single hit from a sword, either because you ran him through the heart or because he was a newbie and any decent would could drop him, while others take several hits and might hurt you along the way, and still others are serious threats but you gut them in one hit before they really get a chance to shine, while the best veterans in the group are a serious threat to your life and take some work to wipe them out.